Molar Mass and Number of Moles Calculation
How is molar mass defined?
In chemistry, what is meant by the term "molar mass"?
What is the molar mass of gold?
What is the molar mass of gold, and how is it calculated?
How many moles are in 158 grams of gold?
Calculate the number of moles present in 158 grams of gold.
Molar Mass Definition:
The molar mass of a substance is defined as the mass in grams of one mole of the compound. It is determined by dividing the mass of the substance by the amount of substance measured in moles.
Molar Mass of Gold:
The molar mass of gold is 196.967 g/mol. This value is obtained by adding the standard atomic masses of the constituent atoms in the compound.
Number of Moles in 158 Grams of Gold:
To calculate the number of moles of gold in 158 grams, we can use the formula:
moles = mass / molar mass
moles = 158 g / 196.967 g/mol
moles ≈ 0.802 mol
The molar mass of a substance is a crucial concept in chemistry, as it allows us to relate the mass of a sample to the number of moles present. By knowing the molar mass of a compound, we can calculate the number of moles in a given mass of the substance.
In the case of gold, which has a molar mass of 196.967 g/mol, we can determine that there are approximately 0.802 moles of gold present in 158 grams of the element. This calculation is done by dividing the mass of the sample by the molar mass of gold.
Understanding molar mass and its application in calculating the number of moles is essential for various chemical reactions and stoichiometry problems. It provides a direct way to convert between mass and moles, aiding in the accurate analysis of chemical reactions.